OBSERVATIONS AT NEW YORK ZOOLOGICAL PARK 153 



Then seeming to feel that noise was his best fighting asset 

 (see paragraph after no. 280), he added to it considerably by 

 knocking a tin pan that was left in his cage from supper the 

 night before, against the iron wall. He kept up the din by 

 hitting the pan first with one fist, then with the other, contin- 

 uing this performance as long as the danger threatened. 



Others of his stamping rhythms that he used when demand- 

 ing food: 



303 



